CVE-2018-6948: In CCN-lite 2, the function ccnl_prefix_to_str_detailed can cause a buffer overflow, when writing a prefix to

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-6948 is a critical-severity flaw (CVSS 9.8) affecting ccn-lite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In CCN-lite 2, the function ccnl_prefix_to_str_detailed can cause a buffer overflow, when writing a prefix to the buffer buf. The maximal size of the prefix is CCNL_MAX_PREFIX_SIZE; the buffer has the size CCNL_MAX_PREFIX_SIZE. However, when NFN is enabled, additional characters are written to the buffer (e.g., the "NFN" and "R2C" tags). Therefore, sending an NFN-R2C packet with a prefix of size CCNL_MAX_PREFIX_SIZE can cause an overflow of buf i

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-119
Published	2018-02-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ccn-lite

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-02-13 17:29 UTCPublished CVE record published
2026-06-17 02:02 UTCUpdated Record last modified

ccn-lite ccn-lite DOWNGRADE

Affected: 2.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy ccn-lite || rpm -q ccn-lite || ccn-lite --version

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison ccn-lite sudo apt install ccn-lite=<VERSION_BEFORE_2.0.0> sudo apt-mark hold ccn-lite

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ccn-lite sudo dnf downgrade ccn-lite-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add ccn-lite

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-6948?

ccn-lite: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-6948 being exploited?

CVE-2018-6948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-6948 affect?

CVE-2018-6948 affects ccn-lite. Severity is critical (CVSS 9.8). In CCN-lite 2, the function ccnl_prefix_to_str_detailed can cause a buffer overflow, when writing a prefix to the buffer buf. The maximal size of the prefix is CCNL_MAX_PREFIX_SIZE; the buffer has the size CCNL_MAX_PREFIX_SIZE. However, whe

How urgent is CVE-2018-6948?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-7039 CRITICAL 9.8 DOWNGRADE CCN-lite 2.0.0 Beta allows remote attackers to cause a denial of service (buffer overflow) or possibly have un
CVE-2018-6953 CRITICAL 9.8 DOWNGRADE In CCN-lite 2, the Parser of NDNTLV does not verify whether a certain component's length field matches the act
CVE-2018-6480 HIGH 8.8 DOWNGRADE A type confusion issue was discovered in CCN-lite 2, leading to a memory access violation and a failure of the
CVE-2018-12889 CRITICAL 9.8 DOWNGRADE An issue was discovered in CCN-lite 2.0.1
CVE-2017-12473 HIGH 7.5 UPGRADE ccnl_ccntlv_bytes2pkt in CCN-lite allows context-dependent attackers to cause a denial of service (application

References

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